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RSI (Relative Strength Index) Calculator
x402
RSI (Relative Strength Index) Calculator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Computes the Relative Strength Index (RSI) using Wilder's smoothing over a supplied price series, returning one value per input position (null until the first full period).
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute the relative strength index (Wilder's smoothing, default period 14) over a price series you supply, such as daily closes. Returns one value per input position (null until the first full period), the latest value, and a reading: overbought at 70 or above, oversold at 30 or below, else neutral. No market data is fetched: pass your own closes.
Output
An array of RSI values (one per input price), where the first (period - 1) entries are null (warm-up period), followed by floating-point RSI values between 0 and 100 computed using Wilder's exponential smoothing method.
Example use cases
Overbought/oversold stock screening
“I have 30 days of closing prices for AAPL — can you calculate the RSI using the default 14-period Wilder smoothing and tell me whether it's currently overbought (above 70) or oversold (below 30)?”
Crypto momentum signal for trading bot
“Run RSI with a 21-period look-back on this array of Bitcoin hourly closes and return all the RSI values so my bot can decide when to enter a long position.”
Custom period RSI for swing trading strategy
“I'm backtesting a swing trading strategy and need RSI computed with a 9-period look-back over these 60 daily closes for ETH — give me the full array of RSI values, nulls included for the warm-up period.”
Technical details
Endpoint
POSThttps://agent402.tools/api/rsi?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a standards-compliant RSI using Wilder's smoothing (not simple moving average) and want to supply your own price series rather than fetching it from a data provider. Ideal for backtesting pipelines, trading signal generation, or on-the-fly technical analysis where you already have the price data in hand. Prefer this over bundled research skills when you only need the RSI computation itself without additional API calls.
Side effects
- Fewer than period+1 values supplied — returns error or all nulls
- Period outside the allowed range of 2–200 — validation error
- More than 10,000 values submitted — request rejected
- Non-numeric values in the price series — parsing or validation error
- Payment not provided or invalid — 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| period | number | Look-back period, 2 to 200 (default 14) |
| values | array | Price series, oldest first (closes), at least period + 1 values, max 10000 |
Output
Schema · Response
{
"type": "json",
"example": {
"rsi": [
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
null,
70.4641,
66.2496,
66.4809,
69.3469,
66.2947,
57.915
],
"count": 20,
"latest": 57.915,
"period": 14,
"reading": "neutral"
}
}Tags
x402
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